Teeth for excavating dippers and the like



Feb. 25, 1930. w. E. MILEY 8,

TEETH FOR EXGAVATING DIPPERS AND THE LIKE Original Filed Aug. 17, 1926 2 Sheets-.Sheet l g JIM ATTORNEY 'Feb. 25, 1930.

w. E. MILEY 1,748,359

TEETH FOR EXCAVATING DIPPERS AND THE LIKE Original Filed Aug. 1'7. 1926 2 Sheets-Sheet 2 WALTER E. M/LEY 5,44% 027%: ATTORNEY Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE- WALTER E. MILEY, OI MARION, OHIO, ASSIGNOR TO THE MARION STEAM SHOVEL GOM- IPANY, F MARION, OHIO, A CORPORATION OI OHIO TEETH FOR EXCAVATING DIPFERB AND THE LIKE v Original application filed August 17, 1926, Serial No. 129,842. Divided and this application filed February 7, 1928. Serial No. 852,601.

This invention relates to teeth for excavating dippers and the like and is designed more particularly for use on the excavating dip- 1 pers of power shovels, the present applica- 5 tion being a division of the application for patent filed by me August 17, 1926, Serial N0.129,s42.

The dipper of a power shovel is usually provided with a plurality of teeth spaced apart across the forward edge of the front of the dipper. These teeth extend forwardly from the forward edge of the dipper front for a considerable distance and each tooth has a rearwardly extending portion arranged beneath the dipper front, so that the forward edge of the front is arranged at a distance from the forward ends of the teeth and from the lower surfaces of the teeth and will pass over, without removing, considerable quantities of material which lies between the paths of the teeth. When the dipper is in its fully retracted position and is resting upon the oints of the teeth the dipper front is in an inclined position with relation to the surface of the work and the forward edge thereof is spaced such a distance from said surface that it will pass over relatively large quantities of material lying between the paths of the teeth. As the dipper is advanced during the excavating operation the front will assume a position approximately parallel with the surface of the work but even in this position the forward edge of the dipper front is spaced from the surface of the work a distance corresponding to the thickness of the lower portions of the teeth and will pass over considerable quantities of material. As a result the surface of the work is left in a rough condition with relatively large quantities of loose material thereon and in many classes of excavating work, such as street and road work, this is highly objectionable and it is necessary that the surface be smoothed and the loose material removed by means other than the dipper. Further, the forward edge of the dipper front functions as a cutter and is therefore subject to severe wear which makes it necessary to renew the same at more or less frequent intervals.

One object of the invention is to provide an excavating dipper having devices su ported by the dipper teeth and arranged in advance of the dipper front at the sides of the teeth to protect the dipper front from wear, which devices are removable so that they may be renewed when worn.

A further object of the invention is to provide such an excavating dip er having renewable devices supported by t e teeth in advance of the dipper front which will act as supplemental cutters to remove the material from the surface of the work between the teeth and below the level of the front.

A further object of the invention is to provide such an excavating dipper having supplemental cutters carried by the teeth which can be adjusted to compensate for wear and to maintain the cutting edges thereof in proper relation to the dipper teeth.

A further object of the invention is to provide means for removably mounting protecting and cutting devices on the bases of twopart teeth. e

Other objects of the invention will appear as the device is described in detail.

In the accompanying drawings Fig. 1 is a plan view of portions of two dipper teeth showing the same equipped with my invention; Fig. 2 is a vertical sectional view taken on the line 22 of Fig. 1; Fig. 3 is a detail view of the adjustable cutter; and Fig. 4 is a front elevation of the dipper front and teeth, showing the supplemental cutters in position thereon.

In these drawings I have illustrated one embodiment of my invention and have shown the same as applied to a two-part dipper tooth of the type shown and described in the application for patent filed by me April 22, 1925, Serial No. 24,957. It will be understood however, that this particular embodiment has been chosen for the purpose of illustration only, and the invention may take various forms and maybe applied to dipper teeth of various kinds comprising any desired number of parts.

In that form of the invention here illustrated I have shown the same as applied to a two-part tooth comprising a base 1 and a oint 2 detachably secured to said base. The ase of the tooth has a rearwardly extending lower portion 3 and a rearwardly ex the upper and lower portions of the tooth.

The base of the tooth also has a forwardl extending central portion 7 provided in bot sides thereof with. recesses 8. The point 2 of the tooth has rearwardly extendin por-- tions or arms 9 spaced apart to receiv between them the central forwardly extending portion 7 of the base and each arm has an: inwardly extending lug 10 adapted to enter.

the adjacent recess 8 inthebase. After the lugs have been inserted'in the recesses the point of the tooth is moved to'the' position shown in the drawings and is rigidly secured in that position by means of a bolt 11. The base of the tooth also has forwardly extending arms 12, the forward portions of which contact with the respective sides of the point 2 and brace the same against lateral strain.

In order to remove from the surface of the work the material which lies between the paths of the dipper teeth and below the level of the dipper front, and also to protect the dipper front from wear, I mount upon the teeth and between adjacent teeth suitable parts or blades which are preferably arranged with their forward or cutting edges adj acent to the lower surface of the respective teeth and have their upper surfaces inclined upwardly and rearwardly and which terminate adjacent to and in advance of the forward edge of the'dipper front These devices or blades Will thus remove from the surface of the work ractically all the material between the pat s of the teeth and will deliver this material onto the dipper front and at the same time they will relieve the dipper front of its function as a cutter and thus protect the same from wear. These supplemental devices or cutters may be mounted on the teeth in any suitable manner but inasmuch as they are subject to wear it is desirable in some cases that they should be removable so that they may be renewed in the event they wear out before the dipper tooth wears out and it is also sometimes desirable that they should be adjustable to compensate for wear and thus maintain the cutting edges thereof in the desired relation to the dipper teeth. In the present construction I have utilized the forwardly projecting lateral portions or side arms 12 of the bases 7 of the teeth as supports for the supplemental devices. To this end the arms 12 are provided with laterally extending parts or plates 17 which are arranged at an inclination to the length of the tooth and which form the supports for the supplemental devices. The supplemental devices may take various forms devicebetween each pair of teeth, t dGVlQQ being in the form of a blade 19 which is' sup-.

ported on the laterally extending supports17 of adjacent teeth so that it's u p r surface is inclined upwardly and rearwar y. The for-.

ward edgeof the plate is preferably. rovided with a cutting edge which is arrange close to blade is mounted. In the particular constructhe lower surface of the teeth on which the -76 tion here shown, the laterally extending sup-- ports'or plates. 17 are of such a width that their combinedwidth will bridge substan' tially the entire space between the two teeth; i

Theadjacent edges of the two support' plates may abut one I against the other but it is preferable to allow some cle'arancebe-.

tweenthe same to take care of variationsin" width in manufacture. The. two supporting plates are provided in their upper surfaces with recesses 18 which open through the ad'- jacent edges thereof and are arranged in line I one. with the other so as to. provide in the supporting structure as a whole a relatively wide. recess. The blade 19 rests upon the supporting plates 17 and may be rigidly secured thereto in any suitable manner as by. means of a bolt 23 extending through the blade and through a suitable opening 22 in the supporting structure, this opening being here shown as formed by providing the two supporting plates in their adjacent edges with substantially semi-circular recesses which combine to form a bolt hole. When the blade is to be adjustable the opening in the blade which receives the bolt is preferably in the form of a longitudinal slot 21. I prefer to provide the. blade with a downwardl extending or depressed portion 20 adapte to fit in the recesses 18 in the supporting structure and to receive the head of the bolt 23. The

bolt itself may be relied upon to retain the blade in its adjusted position but I prefer to provide means to positively hold the blade in adjusted positions and for this purpose I have formed in each of the supporting plates 17, adjacent to the respective teeth, aseries of notches or teeth 25 and have formed on the blade, on the respective sides of the depressed portion thereof, projections or teeth 26 which are adapted to enter any one of the respective notches 25, thereby providing an interlocking connection which will positively hold the blade against displacement. When the cuttin edge of the blade wears away the bolt may e released and the projections 26 advancedinto the next lower notches and the bolt again tightened down, thus bringing the cutting edge of the blade again 1nto proper relation to the dipper teeth. If the blade is worn away-to such an extent that it can no longer be adjusted to the proper position with relation to the teeth it may be removed and a new blade substituted therefor.

It willvbe apparent, therefore, that I have "provided a dipper with supplemental cut-ters which will remove the material from the surface of the work between the teeth and will leave a substantially clean smooth surface and that these cutters will fprotect the forward edge of the dipper ront from wear; that these supplemental cutters ,or guards are removable so thatthey may be renewed when worn out; and, further, that the cutters are adjustable with relation to the teeth to compensate for wear; By utilizing theforwardly extending side portions 12 of'the base of the tooth as supports for the supplemental cutters or guards these devices are supported in the desired relation to the points of the teeth but are supported upon the bases of the teeth, which are subject to less wear than are the points.

While I have shown and described one embodiment of myinvention I wish it to be lmderstood that I do not desire to be limited to the details thereof as various modifications may occur to a person skilled in the 1. In an excavating dipper or the like hav ing a plurality of teeth secured to the front thereof and spaced one from the other, a

- single part arranged between each pair of adjacent teeth in advance of said dipper front to protect the" latter from wear, and means to rigidly but removably secure said parts to the respective dipper teeth.

2. In an excavating dipper or the like having a plurality of teeth secured to the front thereof and spaced one from the other, a single guard arranged between each pair of adjacent teeth in advance of the dipper front, said teeth having laterally extending portions to form supports for said guards, and means for rigidly but removably securing said guards to the supporting portions of said. teeth.

3. In an excavating dipper or the like having a plurality of teeth secured to the front thereof and spaced one from the other, supplemental cutters separate from said teeth and arranged alongside of the same with their forward edges adjacent to the lowest surfaces of the adjacent teeth, and means for rigidly securing said supplemental cutters to the respective teeth.

4. In an excavating dipper or the like having a plurality of teeth secured to the front thereof and spaced one from the other, supplemental cutters separate from said teeth and arranged alongside of the same in inclined positions in advance of said dipper front with their forward ends adjacent to the lowest surfaces of the respective teeth and their rear ends adjacent to said dipper front, and means for rigidly securing said supplemental cutters to said dipper teeth.

5. In an excavating dipper or the like having .a plurality of teeth secured to the front thereof and spaced one from the other, supplemental cutters adjustably supported alongside of said teeth, and means for rigidly securing said supplemental cutters to the respective teeth in adjusted positions with relation thereto.

6. In an excavatin dipper or the like, having a plurality o teeth secured to the front thereof and spaced one from the other, said teeth having laterally extending portions forming supports, a single supplemental device arranged in each space between adjacent teeth and having its forward edge adjacent to the lower surfaces of said teeth, and means for rigidly securing said supplemental device on said supports.

7. In an excavating dipper or the like having a plurality of teeth secured to the front thereof and spaced one from the other, said teeth having laterally extending portions forming supports, supplemental cutters mounted on said supports for adjustment lengthwise thereof, and means for rigidly securing said supplemental cutters in adjusted'positions on said supports.

8. In an excavating dipper, a plurality of teeth secured to the front of said dipper and spaced one from the other, each of said teeth having parts arranged at the respective sides thereof to form supports, supplemental cutters arranged between adjacent teeth and mounted on said supports, and means for securing said supplemental cutters in adjusted positions with relation to said teeth.

9. In an excavating dipper, a plurality of teeth secured to the front of said dipper and spaced one from the other, each of said teeth having a part extending laterally from each side thereof, a supplemental device mounted on said laterally extending parts of adjacent teeth, and a single device for rigidly securing said supplemental device to said laterally extending parts.

10. In an excavating dipper, a plurality of teeth secured to the front of said dipper and spaced one from the other, each of said teeth having parts on the respective sides thereof forming supports, a cutter adj ustably mounted between each pair of adjacent teeth on the supports carried by said teeth, and means for rigidly securing said cutters to the respective supports.

11. In an excavating dipper, a plurality of teeth secured to the front thereof and spaced one from the other, and a single supplemental cutter arranged between each pair of teeth and rigidly secured to said teeth.

12. In an excavating dipper, a plurality of teeth secured to the front of said dipper and spaced one from the other, each of said teeth having parts on the respective sides thereof constituting supports, supplemental cutters arranged between adjacent teeth and adjust- 4 l I I 1,748,859

ably mounted on the respective supports, said its upper surface inclined downwardly and supplemental cutters and said supports havforwardly to a oint adjacent to the lower ing interlocking parts to position said su surface of said plemental cutters with relation to said teet su port fora supplemental device. g

13. In an excavating dipper a plurality and spaced one from the other, each of said teeth having parts on the respective sides thereof constituting supports and each of said supports having a series of notches, supplemental cutters arranged between adjacent teeth, mounted on the respective supports and having projections adapted to enter the corresponding notches in said supports, and means for rigidly securing said supplemental cutter to said supports.

14. In an excavating dipper, a plurality of teeth secured to the front of said dipper and spaced one from the other, each of said teeth having parts extending laterally from the respective sides thereof and constituting supports, the supporting parts between each pair of teeth having their adjacent edges arranged close one to the other and provided with alined recesses, and a supplemental cutter arranged between each pair of teeth, mounted on said supports and having a longitudinal slot, and a fastening device extending through said slot and the recesses in said supporting parts to secure said supplemental cutter in adjusted positions with relation to said teeth.

15. In an excavating dipper, a plurality of teeth each comprising a base rigidly secured to the front of said dipper and a point detachably secured to said base, said teeth being spaced one from the other, the bases of said teeth being provided with parts forming supports, supplemental cutters carried by said supports, and means for rigidly securing said supplemental cutters to said supports.

16. In an excavating dipper, a plurality of teeth each comprising a base rigidlysecured to the front of said dipper and a point detachably secured to said base, said teeth being I spaced one from the other, the bases of said teeth being provided with parts forming supports, suplplemental cutters adj ustably mounted on sa1 supports, and means for rigidly securing said cutters to said supports in adjusted positions with relation thereto.

17. In an excavating dipper, a plurality of teeth each comprising a base rigidly secured to the front of said dipper and a point de? tachably secured to said base, the base of each tooth having on each side thereof sup porting members, supplemental cutters arranged between adjacent teeth and mounted on the respective supporting'members, and means for rigidly securing said supplemental cutters in adjusted positions with relation to said teeth.

18. A tooth for an excavating dipper comprising a base and a point detachably secured to said base, said base having on each side thereof a laterally extending part having of teeth secured to the front 0 said dipper hereto.

n testimony whereof, I my signature WALTER E. MILEY.

use and adapted to form a 

